Heterosis in a crossbred animal is usually measured as the superiority of its performance over the:
Correct answer: C. Average performance of its parent breeds
- A. Performance of the older parent breed
- B. Performance of the poorer parent breed
- C. Average performance of its parent breeds
- D. Average performance of unrelated purebreds
Explanation
Heterosis, or hybrid vigour, is commonly calculated by comparing crossbred performance with the average of the two parental breed performances. It is not simply the difference from the poorer parent.
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About Animal Breeding and Genetics
Covers genes, chromosomes, inheritance, genetic variation, mutations, heritability and quantitative traits in livestock. It also includes selection methods, breeding systems, inbreeding, crossbreeding, heterosis and evaluation of traits such as growth, milk yield, fertility and disease resistance.
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